ruby-lsp-rubyfmt-formatter

January 14, 2026 ยท View on GitHub

A Ruby LSP add-on that provides formatting support using rubyfmt.

Installation

Add this gem to your application's Gemfile:

bundle add ruby-lsp-rubyfmt-formatter

Or install it directly:

gem install ruby-lsp-rubyfmt-formatter

Usage

Once installed, configure your VSCode settings to use rubyfmt as the formatter:

{
  "[ruby]": {
    "editor.defaultFormatter": "Shopify.ruby-lsp",
    "editor.formatOnSave": true
  },
  "rubyLsp.formatter": "rubyfmt"
}

By default, the extension uses the rubyfmt in your PATH, or see the configuration options below for passing a specific path.

For instructions on installing rubyfmt itself, see the docs.

Configuration Options

You can customize the rubyfmt behavior via rubyLsp.addonSettings in your VSCode settings:

{
  "rubyLsp.formatter": "rubyfmt",
  "rubyLsp.addonSettings": {
    "rubyfmt": {
      "rubyfmtPath": "/custom/path/to/rubyfmt",
      "rubyfmtArgs": "--include-gitignored"
    }
  }
}

Available Options

OptionTypeDefaultDescription
rubyfmtPathString"rubyfmt"Path to the rubyfmt executable. Uses PATH by default.
rubyfmtArgsString""Additional arguments to pass to rubyfmt.

Contributing

Bug reports and pull requests are welcome on GitHub at https://github.com/reese/ruby-lsp-rubyfmt-formatter.